needing help with fourth childs name

i already have 2 boys and a girl there names are Arlo james killara alek william kalti gabriella constance iona

for a boy we have .......... david jarrah
for a girl we have ............. alison kadee/kirra

first middle names some are ggparents some are grandparents and one of my uncles and they will not change second mn are for there dads heritage they are the only names we can agree on atm we need help with first names please